Because if they changed it, 1% would be happy while the other 99% would complain about high charges. And $1000 phone bills because of an iCloud backup are the s

Because if they changed it, 1% would be happy while the other 99% would complain about high charges. And $1000 phone bills because of an iCloud backup are the stories that go viral. You can warn 3 times and people would still agree and complain later. Disallowing options that are costly for the vast majority is the only option. The number of iphone users with true unlimited data is probably <5%.